Cutting-bit for chains of mining-machines.



. C. N. BARTON.

CUTTING BIT FOR CHAINS 0P MINING MACHINES.

APPLICATION FILED IEB.10, 1913.

1,078,082. I Patented No 11,1913.

CHARLES N. BARTON, or HARRISBURG, ILLI'NoIs, AssIGRoR or TED STATESPATENT OFFICE.

ONE-HALF '10 AMES B. .BLACKMAN, OF HARRISBURG, ILLINOIS.

CUTTING-BIT FOR GHAIN$ OF MINING-MACHINES.

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Specification of Letters Patent.

Patented Nov. 11, 1913.

Application filed February 10, 1913. Serial No. 747,397.

has for its primary object the provision of a bit which may be reversedin its mounting and which will be provided with a plurality of efiectivecutting ends or points whereby when one becomes worn or destroyed, the lother one' may be readily and effectually presented for use.

Another object of the invention is the provision of means traversing theaxis of the bit-way and provided with a coacting surface which may beadvanced into mutual engagement with ,a similar surface of the bit andheld, so as to hold the bit operatively projected to perform itsfunction.

A further object of the invention is the provision of a bit having twoof its surfaces provided with teeth; a mounting provided with a bit-wayand having one of its walls provided with co-engaging teeth, and animinging or'clampingmember traversing the hit-way and provided with asurface coacting with one of the toothed surfaces of the the bit, so asto ing the other surface of the bit and the coacting surface of themounting into operative engagement.

With these and other objects in view, the invention consists of certainnovel features of construction, combination and arrangement of parts, aswill be hereinafter described and claimed.

In the accompanying drawings :Figure 1 is a side view of a chain link,showing the bit in its applied position thereto; Fig. 2 is a verticalsection therethrough, showing the bit in' elevation; Fig. 3 is a topplan View of the link andbitf Fig. 4 is a perspective view of the bit;and Fig. 5 is a perspective view of the impinging or clamping member.

The link 1 isprovided at one side w1th bit and operating to effectadjustments of van integral lug 2, in which is formed a bitway 3disposed diagonally to the longitudinal plane of the link and providedwith a wall having transversely arranged teeth or corrugations 4. Theblt-way opens onto the opposite sides of the link, and as illustratedsaid bit-way is adapted to adjustably receive a correspondingly formedbit 5 having identically constructed points 6 which extend ,beyond theopposite ends of the bit-way when so that one of the points will beoperatively projected to perform its function.

A guide slot 7 is formed in the lug or mounting 2 and is arranged totraverse the bit-way 3 and to slidably accommodate an impinging member8. The impinging member is preferably of rectangular configuration,conforming transversely with the slot 7, so that the member will bepositively held against turning. The impinging member is provided with alongitudinally extending slot 9 having a length exceeding the width ofthe bit 5, so that the latter may be freely advanced through the slot inthe operation of initially fixing the hit upon the link. The

end wall 10 of the slot 9 lies parallel with the toothed wall 4 of thebit-way 3, so as to form a guiding surface to properly deflect one ofthe points 6 into the branch 3 of the bit-way when the impinging member.is adjusted to a released position. This construction is desirable inthat the bit may be advanced into the bit-way with facility and freedom.A wall 11 of the impinging memher 8 lies parallel mounting or lug 2, andis provided with transversely extending teeth which are adapted forinterfitt-ing engagement with either set of teeth or corrugations 12 ontwo edges of the bit. The toothed wall 11 of the impinging member isdisposed to one side of the plane of the toothed wall 4: of the mounting2 whereby when the impinging member is adjusted to an operative clampedposition the surface 11 Will be drawn into mutual contact with one ofthe surfaces 12 and then tend to tilt the bit and cause the surface 4 tobe brought into interlocking engagement with the other set of teeth 12on the bit. The impinging member is provided with a reduced cylindricalshank 13, which is threaded for the reception of a clamping u nut 14.The shank extends through a passage 15 in one endof the mounting 2, and

as illustrated in Fig. 2 the nut may be adeffective cutting the key isapplied '65 with the wall 4 of the 90 justed to bear against one end ofthe mounting and thereby retain operative adjustments of the impingingmember and bit respectively.

From the construction described, it is evident that the cutting bit maybe reversed at the discretion of the operator, so that when one of thecutting points 6 is worn or destroyed another point may be quicklysubstituted therefor. The fact that the impinging member 8 is providedwith a toothed surface 11 mutually cooperating with similar surfaces ofthe bit, insures operative retention of the bit and affords means foreffecting such retention Without resulting in injuring the toothedsurfaces of the bit during the clamping operation.

Having thus described my invention, what I claim is I p The combinationof a chain link having a lug formed with a key-way of rectangular crosssection passing through the body of the lug, and in th lengthwisedirection thereof," and an intersecting and longitudiof the first namedkey-way being prov1 nally disposed slot of rectangular cross section;said keyway provided on a portion of one wall thereof with a pluralityof corrugations; a'block of rectangular design slidably mounted in saidlongitudinal slot of rectangular cross section, and provided with akey-way adapted to register with the keyway in the lug; the wall of thekey-way of the slidable block opposite the corrugatigns ed withcorrugations; a bit fitting Within said registering key-ways andprojecting at either end beyond the lug and link, said bit having a pairof opposite Walls thereof formed with corrugations adapted to engagewith the corrugations of said key-Ways; and a device for clamping saidslidable block to secure the bit in position.

In testimony whereof I afiix my signature in presenceof two witnesses.

CHARLES N. BARTON. Witnesses H. H. BYRNE, R. S. PERSON.

